[PATCH iwl-next 04/12] idpf: avoid bloating &idpf_q_vector with big %NR_CPUS
From: Alexander Lobakin
Date: Tue May 28 2024 - 09:50:21 EST
With CONFIG_MAXSMP, sizeof(cpumask_t) is 1 Kb. The queue vector
structure has them embedded, which means 1 additional Kb of not
really hotpath data.
We have cpumask_var_t, which is either an embedded cpumask or a pointer
for allocating it dynamically when it's big. Use it instead of plain
cpumasks and put &idpf_q_vector on a good diet.
Also remove redundant pointer to the interrupt name from the structure.
request_irq() saves it and free_irq() returns it on deinit, so that you
can free the memory.
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@xxxxxxxxx>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@xxxxxxxxx>
---
drivers/net/ethernet/intel/idpf/idpf_txrx.h | 7 +++----
drivers/net/ethernet/intel/idpf/idpf_lib.c | 13 ++++++-------
drivers/net/ethernet/intel/idpf/idpf_txrx.c | 20 +++++++++++++-------
3 files changed, 22 insertions(+), 18 deletions(-)
diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
index ce4ade9c864f..9e4ba0aaf3ab 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h
@@ -505,7 +505,6 @@ struct idpf_intr_reg {
/**
* struct idpf_q_vector
* @vport: Vport back pointer
- * @affinity_mask: CPU affinity mask
* @napi: napi handler
* @v_idx: Vector index
* @intr_reg: See struct idpf_intr_reg
@@ -526,11 +525,10 @@ struct idpf_intr_reg {
* @num_bufq: Number of buffer queues
* @bufq: Array of buffer queues to service
* @total_events: Number of interrupts processed
- * @name: Queue vector name
+ * @affinity_mask: CPU affinity mask
*/
struct idpf_q_vector {
struct idpf_vport *vport;
- cpumask_t affinity_mask;
struct napi_struct napi;
u16 v_idx;
struct idpf_intr_reg intr_reg;
@@ -556,7 +554,8 @@ struct idpf_q_vector {
struct idpf_buf_queue **bufq;
u16 total_events;
- char *name;
+
+ cpumask_var_t affinity_mask;
};
struct idpf_rx_queue_stats {
diff --git a/drivers/net/ethernet/intel/idpf/idpf_lib.c b/drivers/net/ethernet/intel/idpf/idpf_lib.c
index 3e8b24430dd8..a8be09a89943 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_lib.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_lib.c
@@ -69,7 +69,7 @@ static void idpf_deinit_vector_stack(struct idpf_adapter *adapter)
static void idpf_mb_intr_rel_irq(struct idpf_adapter *adapter)
{
clear_bit(IDPF_MB_INTR_MODE, adapter->flags);
- free_irq(adapter->msix_entries[0].vector, adapter);
+ kfree(free_irq(adapter->msix_entries[0].vector, adapter));
queue_delayed_work(adapter->mbx_wq, &adapter->mbx_task, 0);
}
@@ -124,15 +124,14 @@ static void idpf_mb_irq_enable(struct idpf_adapter *adapter)
*/
static int idpf_mb_intr_req_irq(struct idpf_adapter *adapter)
{
- struct idpf_q_vector *mb_vector = &adapter->mb_vector;
int irq_num, mb_vidx = 0, err;
+ char *name;
irq_num = adapter->msix_entries[mb_vidx].vector;
- mb_vector->name = kasprintf(GFP_KERNEL, "%s-%s-%d",
- dev_driver_string(&adapter->pdev->dev),
- "Mailbox", mb_vidx);
- err = request_irq(irq_num, adapter->irq_mb_handler, 0,
- mb_vector->name, adapter);
+ name = kasprintf(GFP_KERNEL, "%s-%s-%d",
+ dev_driver_string(&adapter->pdev->dev),
+ "Mailbox", mb_vidx);
+ err = request_irq(irq_num, adapter->irq_mb_handler, 0, name, adapter);
if (err) {
dev_err(&adapter->pdev->dev,
"IRQ request for mailbox failed, error: %d\n", err);
diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
index 7be5a723f558..f569ea389b04 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
@@ -3613,6 +3613,8 @@ void idpf_vport_intr_rel(struct idpf_vport *vport)
q_vector->tx = NULL;
kfree(q_vector->rx);
q_vector->rx = NULL;
+
+ free_cpumask_var(q_vector->affinity_mask);
}
/* Clean up the mapping of queues to vectors */
@@ -3661,7 +3663,7 @@ static void idpf_vport_intr_rel_irq(struct idpf_vport *vport)
/* clear the affinity_mask in the IRQ descriptor */
irq_set_affinity_hint(irq_num, NULL);
- free_irq(irq_num, q_vector);
+ kfree(free_irq(irq_num, q_vector));
}
}
@@ -3812,6 +3814,7 @@ static int idpf_vport_intr_req_irq(struct idpf_vport *vport, char *basename)
for (vector = 0; vector < vport->num_q_vectors; vector++) {
struct idpf_q_vector *q_vector = &vport->q_vectors[vector];
+ char *name;
vidx = vport->q_vector_idxs[vector];
irq_num = adapter->msix_entries[vidx].vector;
@@ -3825,18 +3828,18 @@ static int idpf_vport_intr_req_irq(struct idpf_vport *vport, char *basename)
else
continue;
- q_vector->name = kasprintf(GFP_KERNEL, "%s-%s-%d",
- basename, vec_name, vidx);
+ name = kasprintf(GFP_KERNEL, "%s-%s-%d", basename, vec_name,
+ vidx);
err = request_irq(irq_num, idpf_vport_intr_clean_queues, 0,
- q_vector->name, q_vector);
+ name, q_vector);
if (err) {
netdev_err(vport->netdev,
"Request_irq failed, error: %d\n", err);
goto free_q_irqs;
}
/* assign the mask for this irq */
- irq_set_affinity_hint(irq_num, &q_vector->affinity_mask);
+ irq_set_affinity_hint(irq_num, q_vector->affinity_mask);
}
return 0;
@@ -3845,7 +3848,7 @@ static int idpf_vport_intr_req_irq(struct idpf_vport *vport, char *basename)
while (--vector >= 0) {
vidx = vport->q_vector_idxs[vector];
irq_num = adapter->msix_entries[vidx].vector;
- free_irq(irq_num, &vport->q_vectors[vector]);
+ kfree(free_irq(irq_num, &vport->q_vectors[vector]));
}
return err;
@@ -4255,7 +4258,7 @@ static void idpf_vport_intr_napi_add_all(struct idpf_vport *vport)
/* only set affinity_mask if the CPU is online */
if (cpu_online(v_idx))
- cpumask_set_cpu(v_idx, &q_vector->affinity_mask);
+ cpumask_set_cpu(v_idx, q_vector->affinity_mask);
}
}
@@ -4299,6 +4302,9 @@ int idpf_vport_intr_alloc(struct idpf_vport *vport)
q_vector->rx_intr_mode = IDPF_ITR_DYNAMIC;
q_vector->rx_itr_idx = VIRTCHNL2_ITR_IDX_0;
+ if (!zalloc_cpumask_var(&q_vector->affinity_mask, GFP_KERNEL))
+ goto error;
+
q_vector->tx = kcalloc(txqs_per_vector, sizeof(*q_vector->tx),
GFP_KERNEL);
if (!q_vector->tx)
--
2.45.1